//
//  ZXTabBar.swift
//  ZXWeibo
//
//  Created by mac on 15/11/23.
//  Copyright © 2015年 itcast. All rights reserved.
//

import UIKit

class ZXTabBar: UITabBar {

    override func layoutSubviews() {
        super.layoutSubviews()
//        print("layoutSubviews")
        
        //计算item的宽度
        let width = bounds.size.width / 5
        
        //创建frame
        let frame = CGRect(x: 0, y: 0, width: width, height: bounds.size.height)
        
        //记录是第几个VIew
        var index = 0
        //重新设置按钮位置
        
        for view in self.subviews
        {
            //判断是否是UITabBarButton 因为这个类是系统的我们不能用我们只能判断它的父类
            if view is UIControl && !(view is UIButton)
            {
                //设置frame 设置按钮的偏移
                view.frame = CGRectOffset(frame, CGFloat(index) * width, 0)
                
                index++
                if index == 2
                {
                    index++
                }
            }
        }
        
        //设置撰写按钮的frame
      composeButton.frame = CGRectOffset(frame, 2 * width, 0)
        
    }
//    懒加载
    lazy var composeButton: UIButton = {
        let button = UIButton()
        //设置参数
        //设置按钮背景图片
        button.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal)
        button.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)
        
        //设置按钮图片
        button.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: UIControlState.Normal)
        button.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
        
    //添加到tabbar里面
        self.addSubview(button)
        
    return button
        
    }()

}
